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TITTUS. 



45 



examples examined by this author, moreover, have the legs and chelae yellowish-red 



and the crests on the fifth sternum scarcely granular. They attained a length of 80 mm 



•4 



The following scorpion has been recorded by Gervais from Mexico, but the identification 



must be regarded as doubtful 



of the differences between the 



species allied to such forms as T. cambridgei, T. festce, and T. androcottoides, especially 

 in the case of the female sex, requires considerable powers of discrimination and analysis, 

 and a large number of specimens from various localities for comparison and study. 

 Hence the Mexican example determined by Gervais as T. obscurus may be referable 

 to either of the three just mentioned, and may or may not belong to the genuine 

 T. obscurus, which was from Cayenne. 



Tityus obscurus. 



Scorpio (Atreus) obscurus, Gervais, Arch. Mus. iv. p. 249 (1844) 1 ; Ins. Apt. iii. p. 55 (1844) 2 ; and 



in Castelnau's Exped. dans l'Amer. du Sud, Myriap. et Scorp. p. 42, 1. 1. figg. 3, 3 a, b (1859) 3 . 



Eab. Mexico (Parzudacki). — Colombia ; Guiana. 



This species was based on a female from Cayenne. Gervais also records it from 



Colombia. 



Except for the statement that T. obscurus possesses twenty-two pectinal teeth, there 

 is nothing in the description that serves to differentiate this species from the females of 

 almost all the many allied forms. That Gervais himself certainly confused more than 

 one form under the name 8. obscurus is attested by his determination of a Colombian 

 specimen with only fifteen pectinal teeth, now in the British Museum, as that species. 



Order PEDIPALPI. 



* 



The Central- American genera of this Order fall into two Suborders, which may be 



4 



diagnosed as follows : 



a. Carapace longer than broad ; chelse forming a pair of stout pincers, their basal 



segments fused in the middle line ; legs of first pair with only the terminal 

 segment subdivided, basal segments of second and third pairs meeting or almost 

 meeting in the middle line ; abdomen elongate, its last three segments narrowed 

 to form a caudal support for a long many-jointed postanal flagellum , . . . Urotricha. 



J. Carapace wider than long; chelse not pincer-like, being without digitiform 



prolongations ; legs of first pair with their three distal segments forming a long 



many-jointed lash, those of the second and third pairs widely separated basally 

 by the sternal area; no postanal flagellum, and the last three abdominal 

 segments not narrowed to form a caudal prolongation Amblypygi. 





